nsave 0.1.0

capturing and saving packets
Documentation 
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use super::tmo::*;
use std::{fmt, hash::Hash, marker::PhantomData};

pub struct Iter<'a, K, V>
where
    K: Eq + Hash,
{
    pub(crate) done: usize,
    pub(crate) len: usize,
    pub(crate) next: *const Node<K, V>,
    pub(crate) phantom: PhantomData<&'a (K, V)>,
}

impl<'a, K, V> Iterator for Iter<'a, K, V>
where
    K: Eq + Hash,
{
    type Item = (&'a K, &'a V);

    /// 仅从最老的一端开始
    fn next(&mut self) -> Option<(&'a K, &'a V)> {
        if self.done >= self.len {
            return None;
        }

        unsafe {
            let k = &(*(*self.next).key.as_ptr()) as &K;
            let v = &(*(*self.next).value.as_ptr()) as &V;
            self.next = (*self.next).next;
            self.done += 1;
            Some((k, v))
        }
    }

    fn size_hint(&self) -> (usize, Option<usize>) {
        (0, Some(self.len - self.done))
    }
}

impl<K, V> fmt::Debug for Iter<'_, K, V>
where
    K: Eq + Hash + fmt::Debug,
{
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        if self.done >= self.len {
            write!(f, "Iter [{:?}/{:?}]", self.done, self.len)
        } else {
            let next = unsafe { &(*(*self.next).key.as_ptr()) };
            write!(f, "Iter [{:?}/{:?} next: {:?}]", self.done, self.len, next)
        }
    }
}

impl<K, V> fmt::Display for Iter<'_, K, V>
where
    K: Eq + Hash + fmt::Debug + fmt::Display,
    V: fmt::Display,
{
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        if self.done >= self.len {
            write!(f, "Iter [{}/{}]", self.done, self.len)
        } else {
            let next = unsafe { &(*(*self.next).key.as_ptr()) };
            write!(f, "Iter [{}/{} next: {}]", self.done, self.len, next)
        }
    }
}